BUG: Fix dynamically allocated memory management

Fix dynamically allocated memory management: create the object on the
stack instead of creating a raw pointer and rely on its automatic memory
management ability for the allocation/release.

Fixes:
```
==20951== 8 bytes in 1 blocks are indirectly lost in loss record 1 of 8
==20951==    at 0x483BE63: operator new(unsigned long) (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==20951==    by 0x17BB03: __gnu_cxx::new_allocator >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >*>::allocate(unsigned long, void const*) (new_allocator.h:114)
==20951==    by 0x17B068: std::allocator_traits >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >*> >::allocate(std::allocator >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >*>&, unsigned long) (alloc_traits.h:443)
==20951==    by 0x17A0C7: std::_Vector_base >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >*, std::allocator >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >*> >::_M_allocate(unsigned long) (stl_vector.h:343)
==20951==    by 0x17797C: void std::vector >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >*, std::allocator >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >*> >::_M_realloc_insert >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >* const&>(__gnu_cxx::__normal_iterator >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >**, std::vector >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >*, std::allocator >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >*> > >, itk::QuadEdgeMeshLineCell >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >* const&) (vector.tcc:440)
==20951==    by 0x175633: std::vector >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >*, std::allocator >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >*> >::push_back(itk::QuadEdgeMeshLineCell >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >* const&) (stl_vector.h:1195)
==20951==    by 0x174461: itk::QuadEdgeMeshPolygonCell >, itk::MapContainer > >, std::set, std::allocator >, itk::GeometricalQuadEdge > > >::QuadEdgeMeshPolygonCell(unsigned long) (itkQuadEdgeMeshPolygonCell.hxx:34)
==20951==    by 0x173459: itkQuadEdgeMeshPolygonCellTest(int, char**) (itkQuadEdgeMeshPolygonCellTest.cxx:92)
==20951==    by 0x136017: main (ITKQuadEdgeMeshTestDriver.cxx:277)
```

Raised, for example, in:
https://open.cdash.org/viewDynamicAnalysisFile.php?id=10662948

Author: jhlegarreta

Modules/Core/QuadEdgeMesh/test/itkQuadEdgeMeshPolygonCellTest.cxx

@@ -89,15 +89,15 @@ itkQuadEdgeMeshPolygonCellTest(int, char *[])
 
 
   // Test point container iterators
-  auto * quadEdgeMeshPolygonCell = new PolygonCellType();
+  PolygonCellType quadEdgeMeshPolygonCell{};
 
-  PolygonCellType::PointIdIterator pointId = quadEdgeMeshPolygonCell->PointIdsBegin();
-  PolygonCellType::PointIdIterator endId = quadEdgeMeshPolygonCell->PointIdsEnd();
+  PolygonCellType::PointIdIterator pointId = quadEdgeMeshPolygonCell.PointIdsBegin();
+  PolygonCellType::PointIdIterator endId = quadEdgeMeshPolygonCell.PointIdsEnd();
   ITK_TEST_EXPECT_TRUE(pointId);
   ITK_TEST_EXPECT_TRUE(endId);
 
-  PolygonCellType::PointIdConstIterator constPointId = quadEdgeMeshPolygonCell->PointIdsBegin();
-  PolygonCellType::PointIdConstIterator constEndId = quadEdgeMeshPolygonCell->PointIdsEnd();
+  PolygonCellType::PointIdConstIterator constPointId = quadEdgeMeshPolygonCell.PointIdsBegin();
+  PolygonCellType::PointIdConstIterator constEndId = quadEdgeMeshPolygonCell.PointIdsEnd();
   ITK_TEST_EXPECT_TRUE(pointId);
   ITK_TEST_EXPECT_TRUE(endId);